The numbers behind the WPP whistleblower case tell a story of their own

The lawsuit between former GroupM executive Richard Foster and WPP is full of competing allegations. But buried in the court filings is a set of numbers — drawn largely from GroupM’s own internal documents — that tell a story worth understanding on its own terms.

Here’s what the data actually shows, broken down by what it refers to.

At its peak, GroupM controlled roughly $60 billion in annual client advertising spend, giving it between 20% and 50% market share in key global markets. That scale was the source of its power: the more client money it aggregated, the better the deals it could extract from media vendors.

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